Finding the Fourth Proportional to 64,787.64, 89,429.31 and 37,938.78

Step by Step Solution

1. Step 1: Write the proportion equation
   64,787.64 : 89,429.31 = 37,938.78 : x
2. Step 2: Convert to fraction form
   64,787.64/89,429.31 = 37,938.78/x
3. Step 3: Cross multiply
   64,787.64x = 89,429.31 × 37,938.78
4. Step 4: Simplify right side
   64,787.64x = 3,392,838,917.64
5. Step 5: Solve for x
   x = 3,392,838,917.64/64,787.64
6. Step 6: Final answer
   x = 52,368.61